Seat and backrest of an ergonomic collapsible chair



FIG. 1 is a top perspective view of the seat and backrest of an ergonomic collapsible chair;

FIG. 2 is a bottom perspective view of the seat and backrest of an ergonomic collapsible chair;

FIG. 3 is a front elevation view of the seat and backrest of an ergonomic collapsible chair;

FIG. 4 is a rear elevation view of the seat and backrest of an ergonomic collapsible chair;

FIG. 5 is a right side elevation view of the seat and backrest of an ergonomic collapsible chair;

FIG. 6 is a left side elevation view of the seat and backrest of an ergonomic collapsible chair;

FIG. 7 is a top plan view of the seat and backrest of an ergonomic collapsible chair; and,

FIG. 8 is a bottom plan view of the seat and backrest of an ergonomic collapsible chair.

The broken lines shown in the figures are included for the purpose of illustrating environment only and form no part of the claimed design. 

CLAIM The ornamental design for a seat and backrest of an ergonomic collapsible chair, as shown and described. 